mileage computer for a carbureted engine

[abently]

So I just read all 20 pages.......... Googled up some 50+ pages as well and am just about done with liquid flow meters.

I vote for an AFM that has temp compensation and a wideband sensor. Get the outputs from that to spit out a number and be happy. Ie Gallons/hour, might cost around $300-400 in the end, but at least it'll be accurate and less fuss.

[racprops]

Darn 20 pages and 50 pages of research and no answer to fuel flow meters...

I have 3 Zemcos (mine are the Cal Custom versions) with the ball flow sensor.

I ran one for a couple of years in a 94 Chevy Van with a carb and it seems to work fine and matched my tanks MPG readings.

I just went though a lot of trouble rigging a external fuel pressure regulator on my 93 Chevy van's TBI and putting a Zemco flow meter between the reg and the TBI with a fuel pressure gauge and a vacuum needle valve to allow my lowing the fuel pressure along with a control on the map sensor...

I did this because the MPGunio seemed to be unable to read the injectors and give real time MPG readouts.

So I am much less happy to read how these do not work right...and worst that IF I should really get better MPG these will fail at the lower fuel rates...

Darn darn.

I clearly remember some of my long road trips and coming down some tall mountains and seeing idle readings (foot off gas) and reading very high MPGs....it seem able to handle low fuel flows then.

My goal has been to get a car to run at as near idle fuel usage as possible... on my 2000 Ford that would be around .45 gals per minute which seems to read around 75+ MPG at 70 MPH. (seen in some down hill runs with a MPGunio and a Scann gauge II)

So does these flow meters fail at these levels of flow or are you talking at a much lower flow??

Rich

[ASV]

https://www.futurlec.com/Flow_Sensor.shtml

[racprops]

Great CAT...THANKS and not sky high prices either...

10,000 THANKS.

Rich

[Teri_TX]

Originally Posted by diesel_john

yes, the spring pushes against inlet pressure.

The diaphram is an accumulator to damp the fuel pump pulses. Providing a more constant pressure to the restricting nozzle. Which is just brass jet.

The correct ball was made of hard plastic or rubber and was the same density as gasoline. It melted either from heat or fuel. the ball needs to be opaque. The ball in the photo is for illustration purposes. It is from a straight pin and the wrong material. I am looking for a black 0.250" glass or plastic ball.

the light source failed and I am going to replace it with a LED. But even with a ball bearing in inside and my flashlight, I can get the display to count fuel by blowing thur it.

I am going to put it on my mechanical injected diesel.

Hi Diesel John,

You should familarize yourself with McMaster Carr. They have all kinds of interesting things in stock. You could spend all your time browsing their products.

See the following link for plastic balls. McMaster-Carr All types of plastics. Polypropylene should be perfectly resistant and what you need.

-- Teri

[P-hack]

Originally Posted by ASV

https://www.futurlec.com/Flow_Sensor.shtml

2.0 to 30.0 L/hr Diesel and Gasoline Flow Sensor for $12.90?!? That is awesome!
data sheet https://www.futurlec.com/FLOWFUEL30L0.shtml

that is 0.528344 gallons/hour to 7.9 gallons/hour (7.5mpg @ 60mph)

Accuracy : +/- 10%, not sure if that includes calibration vs flow rate.

2-8 amps is a bit much, but you can hook it straight to 12v.

looks turbine based. Someone needs to hook this up and count pulses and do some more calibration points.

say idle is 1.2L/hr, that is about 1 pulse per second.

edit: oops, just realized 1.2 is out of range :/ I did something wrong. Fixed , not 0.052 but 0.52 gal/hr on the low end.

[racprops]

Well in US Gals, my Ford uses .45 GPH at idle..

As that is my goal I am waiting for the math.

The other question is is the output compatible to Zemco or even better to the MPGunio.

Rich

[TheTestPilot]

Greetings Gentlemen
I have actually tested the Flow sensor in question ,not on a zemco ,but it should be electrically ok with a Zemco.
This device suffers from bearing friction at low flows ,some where I have a internal picture of this sensor on this site ,from when I was trying to make it work with the MPGUINO.

[racprops]

Can you say at what flow it had problems??

My MPGunio and my Scan Gauge II both show my Ford uses around .50 GPH at idle so was it below that rate where it has problems??

The last one linked is rated for 2.0 LPH what is that in Gals?

BUT this one:https://www.futurlec.com/Flow_Sensor.shtml is rated for 0.8 to 8.0 L/min Flow Sensor

I believe that is : 0.21 US gallons per hour which is lower that I can hope to reach...But it is limited to 2.11 US gallons Per hour which will not read well at WOT but then who is worried at WOT??

And if I want to know I can run the OTHER flow meter for the higher readings as it runs from 2.0 – 30 liter/hour flow rate.

Rich

[P-hack]

someone needs to experiment with piezos and doppler in a length of hdpe tube with a high speed microcontroller (and a graduated cylinder)